Does this appear normal?? Battery Voltage
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Senior User
Joined: Sep 2010
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From: Southwest Desert, AZ
Does this appear normal?? Battery Voltage
Got back from a 3 week business trip. Both batteries low(too low to crank). After charging batts w/2 chargers got her started. Noticed on my Scangauge2 (thank you FTE) that the battery voltage was down to 11V. Took appx 1.5-2 minutes for the alternator to kick it up to 13.6-13.8 volts. Has anyone else seen this? Normal operation? 
FYI do not leave a GPS plugged in with a bad battery. My batteries kept trying to charge it. No problems with batteries after unplugging same. Starts and charges fine except as noted with long alternator build time!
2006 6.0 F350 DRW
FYI do not leave a GPS plugged in with a bad battery. My batteries kept trying to charge it. No problems with batteries after unplugging same. Starts and charges fine except as noted with long alternator build time!
2006 6.0 F350 DRW
Hotshot
Joined: Aug 2006
Posts: 17,398
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From: Whittier, CA
Yes, this is normal on a 6.0 diesel. Your glow plugs are on for up to 2 minutes, and your alternator does not kick on to protect it from the high current draw of the GP. Your charging voltage looks about like mine, at idle.
< Samantha...my Co-Pilot
Joined: Dec 2001
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From: Fallon, Nevada
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Senior User
Joined: Sep 2010
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From: Southwest Desert, AZ
To the best of my knowledge, it only has one alternator. Where is the second one mounted. Couldn't see it in the 6.0 Bible.
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Joined: Jul 2005
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From: Middle Tn.
you need to seperately fully charge and seperately load test the batteries. If one of them is bad, replace both. Low voltage can kill your ficm which you definitely don't want.
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Joined: Aug 2006
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From: Whittier, CA
I took him at his word, that all was fine, except for a 3 week sit. Other than batteries probably being a bit weak/old, I'm not sure why you guys are looking for problems.
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Joined: Sep 2010
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From: Southwest Desert, AZ
FICM voltage at 48V. Definitely made sure that was good. Batteries are less than a year old. Changed them last spring.
Still suspect the GPS dragging it down. Temps went from 80s in mid Nov to 30s while I was gone. Probably put a solar trickle charger on the dash for long down times. I will watch closely and post if it changes either way.
Thanx
Still suspect the GPS dragging it down. Temps went from 80s in mid Nov to 30s while I was gone. Probably put a solar trickle charger on the dash for long down times. I will watch closely and post if it changes either way.
Thanx
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